Enhancement: Add to graphical interface the ability to organize many virtual machines

I use VirtualBox a lot to test different server and network configurations. I have dozens of virtual machines that are grouped in virtual networks. Although I move and sort the related machines together and use preffix names to organize them, could be very useful if VirtualBox graphical interface have the ability to create something like "visual folders" where I can put the related machines together. The physical path of machines remains the same, this is just a logical (visual) way of organize them.